Abstract
In this study, realizing the significant of active nucleation site as an important parameter for predicting heat transfer, the formula of calculating active nucleation site density is given by taking into account the statistical property of active nucleation site on boiling surfaces. In the present approach, the proposed model is explicitly related to the contact angle and wall superheat. It is found that the total number of nucleation sites increases with increasing of the wall superheat. This model contains less empirical constants than the conventional correlations. No additional empirical constant is introduced. An excellent agreement between the proposed model predictions and experimental data is found. The validity of the present model for active nucleation site density is thus verified. The proposed mathematical model can reveal the physical mechanisms of heat transfer in boiling systems.
Highlights
The physical mechanisms of heat transfer in boiling systems have hotly been debated in the past decades and the physical nature is still far from being well understood because of its complexity and diversity (Basu et al, 2002; Xiao et al, 2009, 2010; Jiang et al, 2012)
It has been shown that the density or number of active nucleate sites (Na) on heated surfaces has the great effect on boiling heat transfer
This study focuses on the heat flux nucleate boiling region and attempts to develop a mathematical model for active nucleate sites
Summary
The physical mechanisms of heat transfer in boiling systems have hotly been debated in the past decades and the physical nature is still far from being well understood because of its complexity and diversity (Basu et al, 2002; Xiao et al, 2009, 2010; Jiang et al, 2012). The active nucleation site density is important for predicting the heat transfer in boiling systems. It has been shown that the density or number of active nucleate sites (Na) on heated surfaces has the great effect on boiling heat transfer.
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